sysd.rs

macro_rules! hashmap {
    ($($key:expr => $value:expr), +) => ({
        let mut map = std::collections::HashMap::new();
        $(
            map.insert($key, $value);
        )+
        map
    });
}

fn main() {
    let map = hashmap!{ 1 => "one", 2 => "two", 3 => "three" };
    println!("{:?}", map);
}